Visor attachment mechanism in helmet

Abstract

In this invention, a visor is configured to be inserted into a slit of a movable plate. One of an engaging projecting portion and an engaging concave portion is provided on the visor, and the other is provided on the movable plate. When the visor pivots in a first direction about the engaging projecting portion, a concave corner portion of the visor comes into contact with a first position regulating portion of the movable plate, thereby impeding the pivotal movement of the visor. When the visor pivots in a second direction, the outer wall surface of the visor comes into contact with wall portions of the movable plate, thereby impeding the pivotal movement of the visor.

The invention claimed is: 
     
       1. A visor attachment mechanism in a helmet, wherein the helmet comprises:
 a head protecting body having a window opening formed in a front surface; and 
 a visor attached to said head protecting body to be movable forward and backward with respect to said head protecting body so as to at least partially open or at least partially close the window opening; 
 the visor attachment mechanism comprising:
 a movable plate attached to said head protecting body to be movable forward and backward so as to indirectly attach said visor to said head protecting body via said movable plate; 
 a slit provided in said movable plate to extend substantially in a planar direction of said movable plate so as to receive a region including one of a left end and a right end of said visor and a vicinity thereof, wherein said movable plate further comprises, around said slit, an upper wall portion, a first side wall portion located on a side opposite to an insertion side of said visor to said slit, a lower wall portion, and a second side wall portion located on a lower end on the insertion side of said visor to said slit; and 
 removal preventing means for preventing the region including one of the left end and the right end of said visor and the vicinity thereof from being removed from said slit, wherein said removal preventing means comprises first removal preventing means and second removal preventing means, 
 said first removal preventing means comprises:
 an engaging projecting portion provided on one of said movable plate and the region including one of the left end and the right end of said visor and the vicinity thereof so as to project in a direction substantially perpendicular to the planar direction of one of said visor and said movable plate; and 
 an engaging concave portion provided in one of said movable plate and the region including one of the left end and the right end of said visor and the vicinity thereof so as to engage with said engaging projecting portion when the region including one of the left end and the right end of said visor and the vicinity thereof is inserted into said slit; and 
 
 said second removal preventing means comprises:
 a removal preventing projecting portion is provided in the region including one of the left end and the right end and the vicinity thereof of said visor, said removal preventing projecting portion further comprising a concave corner portion, wherein said removal preventing projecting portion and said concave corner portion extend substantially in a planar direction of the visor substantially toward the downward direction in the region including one of the left end and the right end of said visor and the vicinity thereof; 
 a first position regulating portion formed from an upper end and a vicinity thereof of said second side wall portion of said movable plate to come into contact with said concave corner portion and impede pivotal movement in a first direction out of the pivotal movement of said visor with respect to said movable plate about one of said engaging projecting portion and said engaging concave portion; and 
 a second position regulating portion formed from at least one of said upper wall portion and said first side wall portion of said movable plate to come into contact with the region including one of the left end and the right end of said visor and the vicinity thereof and impede pivotal movement in a second direction out of the pivotal movement of said visor. 
 
 
 
     
     
       2. The visor attachment mechanism according to  claim 1 , wherein said helmet is a full-face-type helmet. 
     
     
       3. The visor attachment mechanism according to  claim 1 , wherein said visor is a sun visor. 
     
     
       4. The visor attachment mechanism according to  claim 1 , wherein said movable plate is attached to said head protecting body via axial support means so as to pivot forward and backward. 
     
     
       5. The visor attachment mechanism according to  claim 1 , wherein said engaging concave portion is a through hole. 
     
     
       6. The visor attachment mechanism according to  claim 1 , wherein said engaging projecting portion is provided in the region including one of the left end and the right end of said visor and the vicinity thereof, and
 said engaging concave portion is provided in said movable plate. 
 
     
     
       7. The visor attachment mechanism according to  claim 1 , further comprising:
 a bent portion formed by a corner portion of an outer wall portion of said movable plate, 
 wherein said bent portion is configured to tilt outward from a proximal end of said bent portion to a distal end of said bent portion at least on an inner surface of said outer wall portion, and 
 said engaging concave portion is configured to relatively and at least partially rise from said engaging projecting portion when said bent portion is raised outward. 
 
     
     
       8. The visor attachment mechanism according to  claim 7 , wherein
 said bent portion has a substantially triangular shape, and 
 a thickness of said bent portion gradually decreases from the proximal end to the distal end substantially continuously. 
 
     
     
       9. The visor attachment mechanism according to  claim 7 , wherein an angle made by an inner surface of said bent portion and an outer surface of said visor falls within a range of 11.5° to 22.5° . 
     
     
       10. The visor attachment mechanism according to  claim 7 , wherein an angle made by an inner surface of said bent portion and an outer surface of said visor falls within a range of 12° to 22° . 
     
     
       11. The visor attachment mechanism according to  claim 7 , wherein an area of the inner surface of said bent portion falls within a range of 12 to 24 mm 2 . 
     
     
       12. The visor attachment mechanism according to  claim 7 , wherein an area of the inner surface of said bent portion falls within a range of 14 to 22 mm 2 . 
     
     
       13. The visor attachment mechanism according to  claim 7 , wherein a distance between an inner surface of said bent portion and an inner end of the distal end of said bent portion rising from the inner surface falls within a range of 0.8 to 1.6 mm. 
     
     
       14. The visor attachment mechanism according to  claim 7 , wherein a distance between an inner surface of said bent portion and an inner end of the distal end of said bent portion rising from the inner surface falls within a range of 0.9 to 1.5 mm. 
     
     
       15. The visor attachment mechanism according to  claim 1 , wherein
 the visor attachment mechanism is configured to move said movable plate forward and backward via a wire connection mechanism by moving an operation knob of an operation knob attachment mechanism forward and backward, 
 said operation knob attachment mechanism comprises an attachment base attached to an outer surface of said head protecting body, a longitudinal guide member attached to an inner surface of said attachment base, and said operation knob attached to said longitudinal guide member to be movable forward and backward, 
 said operation knob comprises a base portion and a knob main body formed into a roof shape on said base portion, and 
 said operation knob is attached to said longitudinal guide member to be slidable forward and backward with respect to said longitudinal guide member by relatively inserting said longitudinal guide member between said base portion of said operation knob and said knob main body of said operation knob. 
 
     
     
       16. The visor attachment mechanism according to  claim 15 , wherein said operation knob attachment mechanism comprises a wire holding member attached to said attachment base so as to locate on an inner surface of said longitudinal guide member,
 said wire holding member being configured to hold a position of a wire sheath portion of said wire connection mechanism. 
 
     
     
       17. The visor attachment mechanism according to  claim 15 , wherein
 said operation knob further comprises an engaging projecting portion, and 
 said longitudinal guide member comprises a first engaging concave portion that engages with said engaging projecting portion by clicking with said engaging projecting portion when said operation knob moves backward, and a second engaging concave portion that engages with said engaging projecting portion by clicking with said engaging projection portion when said operation knob moves forward.